Writing instrument



FIG. 1 is a front elevational view of a writing instrument, showing our new design;

FIG. 2 is a left side elevational view, the right side being a mirror image thereof;

FIG. 3 is a rear elevational view;

FIG. 4 is a top plan view; and,

FIG. 5 is a bottom plan view thereof.

The pattern on the barrel of the writing instrument is continuous throughout the area indicated. 

The ornamental design for a writing instrument, as shown and described. 